Why would anyone ever want to go to the trouble of making home-made yogurt when store shelves are teeming with the stuff? Well, you could say the same thing about home-made bread and home-grown veggies. The point is not to make everything yourself (unless, of course, you want to) but to understand what goes into the making of good food. In doing so, we become informed eaters who are able to make better food choices. Whether you decide to make some yogurt or not, you'll enjoy Alton Brown's explanation of the process.